618881131 has 4 divisors (see below), whose sum is σ = 675143064. Its totient is φ = 562619200.

The previous prime is 618881119. The next prime is 618881143. The reversal of 618881131 is 131188816.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (618881119) and next prime (618881143).

It is not a de Polignac number, because 618881131 - 2⁵ = 618881099 is a prime.

It is a super-2 number, since 2×618881131² = 766027708615678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618881191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28130950 + ... + 28130971.

It is an arithmetic number, because the mean of its divisors is an integer number (168785766).

Almost surely, 2^618881131 is an apocalyptic number.

618881131 is a deficient number, since it is larger than the sum of its proper divisors (56261933).

618881131 is a wasteful number, since it uses less digits than its factorization.

618881131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56261932.

The product of its digits is 9216, while the sum is 37.

The square root of 618881131 is about 24877.3216203031. The cubic root of 618881131 is about 852.1886530567.

The spelling of 618881131 in words is "six hundred eighteen million, eight hundred eighty-one thousand, one hundred thirty-one".